Completely rounded tip provides safe, effective cleaning for wide mouth glassware, including beakers, jars and cylinders. Extra dense natural black bristles are mounted on twisted wires into a durable handle. 
Model 120-30172 has 7.5 cm brush diameter, 15 cm brush length, 40 cm total length and two rows of bristles.
Model 120-30174 has 6.3 cm brush diameter, 12.5 cm brush length and 31.5 cm total length and 4 rows of bristles.